Yes, they replenish every late morning/early afternoon when they come in to clean! Just remember to hide the bottles from the day before in the drawer of the room or something so Mousekeeping will put more out for you,
if you want more, that is! I was accumulating many more than what I needed (because, at the time, it didn't occur to me that some nice folks on DIS may want them! I only thought of that after I got home! Initially I was thinking I would give them to friends of mine), so one day went by where I just left the bottles out from the previous day (unused), so we didn't get an extra set. I mean, they know people are taking them home with them and they expect that, so if you stay for several days and want several sets, you have to make sure to hide them each day. If they see any in the bathroom they won't put more out.
BTW - I did not get a toothbrush. Pycees312 had the concierge, if I recall, so I guess those rooms get toothbrushes. PPH must assume that those of us in the standard rooms don't need to brush our teeth!!